393493866 has 64 divisors (see below), whose sum is σ = 869201280. Its totient is φ = 118200320.

The previous prime is 393493861. The next prime is 393493921. The reversal of 393493866 is 668394393.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (393493861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404761 + ... + 405731.

It is an arithmetic number, because the mean of its divisors is an integer number (13581270).

Almost surely, 2^393493866 is an apocalyptic number.

393493866 is an abundant number, since it is smaller than the sum of its proper divisors (475707414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393493866 is a wasteful number, since it uses less digits than its factorization.

393493866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159.

The product of its digits is 2519424, while the sum is 51.

The square root of 393493866 is about 19836.6798129122. The cubic root of 393493866 is about 732.7896425096.

The spelling of 393493866 in words is "three hundred ninety-three million, four hundred ninety-three thousand, eight hundred sixty-six".